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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	9 Months Ended
	Jan. 29, 2016	Jan. 23, 2015
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 272	$ 236
Additions based on tax positions related to the current year	13	19
Additions for tax positions of prior years	21	102
Decreases for tax positions of prior years	(38)	(24)
Settlements	(52)	(58)
Balance at end of period	$ 216	$ 275

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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